Abstract:

Wavelet theory-based frequency-division processing of seismic data has the advantages of highlighting the local geological characteristics of geologic bodies and microstructure of reservoirs,and revealing the important information contained in thin interbed reflection.Reconstruction of two-dimension frequency-division seismic profile in wavelet domain can generate a 3D seismic data cube,of which the wave amplitude is directly related to the time and frequency.Then,important information for locating and predicting oil and gas reservoirs may be obtained through analysis of the interbed absorption attribute and high-frequency attenuation along the target layers or at the well points.Application of the technology to reservoir prediction and gas detection of the deep Xujiahe Formation in western Sichuan Depression gave out satisfactory results in accordance with log data.

Key words: Wavelet domain, frequency-division imaging, seismic data, interbed absorption, applied research, Xujiahe Formation, Western Sichuan Depression